DC Control Strategy for Suppressing Large-scale WTG Tripping Caused by Mono-polar Block Fault

ZHANG Qirui; LI Fengting; YIN Chunya; LIU Jiangshan; CHEN Ruikang

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DC Control Strategy for Suppressing Large-scale WTG Tripping Caused by Mono-polar Block Fault

更新时间：2025-12-08

- DC Control Strategy for Suppressing Large-scale WTG Tripping Caused by Mono-polar Block Fault
- Vol. 47, Issue 10, Pages: 3528-3537(2021)
- 作者机构：
  
  新疆大学电气工程学院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：31 October 2021，
  
  Published：2021
- 稿件说明：
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ZHANG Qirui, LI Fengting, YIN Chunya, et al. DC Control Strategy for Suppressing Large-scale WTG Tripping Caused by Mono-polar Block Fault[J]. 2021, 47(10): 3528-3537.
DOI：

ZHANG Qirui, LI Fengting, YIN Chunya, et al. DC Control Strategy for Suppressing Large-scale WTG Tripping Caused by Mono-polar Block Fault[J]. 2021, 47(10): 3528-3537. DOI：

摘要

直流单极闭锁故障下交流系统暂态过电压会导致直流近区域新能源机组脱网。针对这一问题

详细分析了单极闭锁对暂态过电压的影响机理并进行验证

发现交流系统大量无功盈余是引起暂态过电压骤升的根本原因;然后基于对单极闭锁故障下健全极整流器功率特性的剖析

以稳态下整流侧换流母线处无功的平衡状态为目标

推导建立了健全极直流电流指令值表达式

提出抑制暂态过电压的直流控制策略。当暂态过电压无法被完全抑制时

为避免风机脱网

提出投入合理容量的调相机进一步抑制暂态过电压的协调抑制策略。最后

基于DIg SILENT仿真平台搭建改进的CIGRE双极标准测试模型与天中直流外送系统模型进行验证。结果表明

该策略能有效阻断暂态过电压的传递

避免风机大规模脱网。

Abstract

To solve the problem that transient overvoltage of AC system will lead to the wind turbine generator（WTG）overvoltage tripping in DC near area under the mono-polar block fault

the influence mechanism of mono-polar block on transient overvoltage is analyzed

and it is pointed out that the excessive reactive power of AC system is the fundamental cause of the transient overvoltage. The characteristics of sound pole under mono-polar block fault are analyzed;in the meantime

by taking the balance state of reactive power at sending bus as regulation target

the expression of DC current command value of sound pole is derived

and the DC control strategy to suppress transient overvoltage is proposed. When the transient overvoltage can not be completely suppressed

under this improved control strategy

a coordinated control strategy is proposed to further suppress the transient overvoltage by putting into a reasonable capacity to avoid the WTG overvoltage tripping. Finally

the improved CIGRE HVDC bipolar standard system and TZ HVDC transmission system are set up on the DIgSILENT simulation platform. It is verified that the strategy can effectively block the transmission of transient overvoltage and inhibit the large-scale WTG overvoltage tripping.

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